Re: [Xen-devel] [PATCH qemu-xen 4.10 & 4.11] xen_disk: Disable file locking for the PV disk backend

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

On Wed, May 22, 2019 at 07:54:42PM +0200, Olaf Hering wrote:
> Am Wed, 22 May 2019 15:51:40 +0100
> schrieb Anthony PERARD <anthony.perard@xxxxxxxxxx>:
> 
> > Can you give it a try with one of the affected qemu? (qemu-xen-4.10 or
> > qemu-xen-4.11)
> 
> Thanks for the patch. Unfortunately there is no easy way to trigger the race.
> Is the changed code path also exercised for PV domUs?

Yes! The code path is executed every time a disk is attached via the
qdisk backend. So as long as guest can access the pv disk, then it's
fine (for both HVM and PV domUs, and PVH).

Another way to make sure that the locking is disable is to attach a disk
to a second guest, qemu should not complain anymore. I've tested both
"raw" disk and "qcow2" disk but I'm not sure if other kind of disk needs
to be tested.

Thanks,

-- 
Anthony PERARD

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